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SUMMARY:Pleistocene glacial cycles: interactions amongst ice\, volcanism\,
  and atmospheric CO2. - Peter Huybers\, Harvard
DTSTART:20101116T163000Z
DTEND:20101116T173000Z
UID:TALK25765@talks.cam.ac.uk
CONTACT:John Maclennan
DESCRIPTION:The coupled quasi-100\,000 year variations in ice volume\,\nte
 mperature\, and atmospheric CO2 during the late-Pleistocene are\ngenerally
  attributed to a combination of orbital forcing\, ice\ndynamics\, and ocea
 n circulation.  It has also been suggested that\nchanges in glaciation inf
 luence CO2 emissions from arc volcanoes.  In\nthis talk the implications o
 f changes in sea level for melt production\nand CO2 emissions at mid-ocean
  ridges are additionally explored.\nAlthough rising sea level is expected 
 to reduce melt production and\nCO2 emissions at mid-ocean ridges---suggest
 ing a negative feedback\nupon deglaciation----the expression of this signa
 l at the ocean floor\nmay be delayed by many thousands of years.  A simple
  model is used to\nillustrate that the presence of a delayed\, negative fe
 edback in CO2\nemissions generally gives rise to oscillations that resembl
 e observed\nglacial/interglacial variations in Pleistocene CO2\, temperatu
 re\, and\nice volume.\n\nHuybers and Langmuir\, Feedback\nbetween deglacia
 tion\, volcanism\, and atmospheric CO2 \, Earth and\nPlanetary Science Let
 ters\, 2009\n(http://www.people.fas.harvard.edu/&#126\;phuybers/Doc/volc_i
 ce.pdf).\n\nOther material can be found at http://www.people.fas.harvard.e
 du/&#126\;phuybers/\n\n\n
LOCATION:Tilley Lecture Theater\, Department of Earth Sciences
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